Polyazo dyestuffs



Patented Jan. 20, 1942 UNITED STATES PAT E NT OFFICE POLYAZO DYE'STUFFS Eberhard Stein, Leverku'sen-schlebus'ch;"Hugo Schweitzer,

Leverkusen-Wiesdorf, and Carl Taube, Leverkusen-I. G. Werk, Germany, as-

signors to General Aniline & Film Corporation, New York, N. Y., a corporation of Delaware No Drawing. Application December 8, 1939, Se-

rial No. 308,168. In Germany December 16,

'5 Claims. (01. 260-166) NH: HOaS I N=N-Mr'-N=NAi In this formula AN=N and A1 N=N stand for radicals of diazotized initial components, M, M1 and M2 stand for radicals ofniiddle components bearing the --N=N groups attached in p-position to each other and n stands for 1 or 0.

The new poly-azo dyestuff can be obtained by coupling the diazo compounds of aminomonoazo dyestuffs in acid medium with 2-amino-5-hydroxynaphthalene-7-sulfonic acid and combining the disazo dyestufis thus obtained in alkaline medium with diazo compounds of aminomonoor disazo dyestufis to form tetrakisor pentakisazo dyestuffs. In particular these poly-azo dyestufis can be prepared e. g. as follows:

The diazo compound of an initial component is coupled with one of the usual middle-components in such a way that the coupling takes place in p-position to the diazotizable amino group of the said middle component. This aminomonoazo dyestufi is them-as. stated above-diazotized and coupled in acid medium: with 2-amino-5-hydroxynaphthalene-7-sulfonic acid. On the other hand the diazo compound of an initial component is coupled with one of the usual middle components in such a way that the coupling takes place in p-position to the diazotizable amino group of the said middle component; this aminomonoazo dyestufi is diazotized and now either coupled in alkaline medium with the first prepared disazo dyestufi or it is first coupled with another molecule of the same or a different middle component in p-position to the diazotizable amino group and this amino disazo dyestufi is then diazotized and coupled in alkaline medium with the first prepared disazo dyestufi. Of initial components chiefly those are of interest particularly the amino salicylic acids, 1. e. aminosalicylic acid, its homologues and substitution products. As middle components amines of the benzene andthe naphthalene series may be used which are capable of coupling in p-position to the diazotizable amino group. These amines may be substituted in the usual manner.

The new dyestuffs dye cotton and regenerated cellulose blue to blue-grey, green-grey, grey to black shades; dyestufis containing metallizable groupings such as coon OH coon (NH2) 0 H Example 1- The hydrochloric diazo suspension of 2.174 mol of diazotized p-aminobenzene-azo-salicylic acid, corresponding to 150 gms. of sodium nitrite, is combined at room temperature to C. with the freshly prepared acid suspension of 2.32 mol of 2-amino-5 hydroxynaphthalene-7-sulfonic acid, corresponding to 160 gms. of sodium nitrite, and 4000 gms. of waterand stirred until the coupling is complete; now the mixture is heated up to .C. In order tovpurify the dyestuff it is separated with sodium chloride from a solution rendered alkaline with sodium carbonate. It is a dark powder which dissolves in water with violetbrown coloration, in concentrate sulfuric acid with greenish blue-green coloration.

This dyestufi can also be. prepared by combining at 40 "C. the acid diazo suspension of the amino-monoazo dyestufi With'the aqueous solution with the O -toluene-sulfonated 2-amino-5- HOQN= N=N SOsH dine and then a suspension of the diazo com pound of the disazo dyestufl corresponding to 6.9 ms. of sodium nitrite, are added while stirring at -2 C. When the coupling is complete the dyestuff is separated by adding sodium chloride, filtered ofi, again dissolved and separated from sodium carbonate alkaline solution by means of sodium chloride. The dyestufi corresponds in the free state to the following formula:

OCH:.OOOH OH HOzS NH:

and dyes cotton greenish grey shades; when OCHLCOOH aftertreated with copper salts grey, with chromium salts olive grey shades are obtained. HO N=N 25 If the diazo compound of the aminodisazo dyestufi of the above constitution is replaced by 1 OOH equivalent quantities of the aminodisazo dyestuffs shown in the table, dyestufis are obtained 03H 503B dyeing cotton the indicated shades:

' Dyein oncott Aminodisazo dyestuffs Dyeing on cotton afte trcated with copper salt 1 801131 OCHICOOBI Greenish grey... Grey.

HO N=N N=N NH,

HO: Hoes 2 SO;H OCHzCOOH Grey Grey.

HO N: N:

3 soar ocmcoon Grey Grey.

OOH H:

4 OCHzCOOH Dark grey Dark grey.

no N= N= QNH,

OCH CH;

5 OCHzCOOH Bluish grey Grey.

QM HQ. OOH H:

6 0011100011 Bluish grey Grey.

. Dyeing on cotton Aminodisazo dyestuffs Dyeing on cotton attertreated with copper salt 7 I 0 CHzC 0 OH Grey-green Greenish grey.

' 1 COOH 8 Dark grey Dark grey. HO N= N=N NH: 7

9 ocmcoon H V Greenish grey.-- Grey. HOGN= N=N NH,

( O O H 0,11 sour 10 ()CaHr Greem'sh grey Grey.

ON: N=N NH, l

S OaH S 03H S 03H 7 11 s 0;}! (I) CHaG 0 0H Greenish grey... Dark gray.

@N: N=N NH:

S 03H H O a S 12 S 03H Greenish grey--. Dark grey.

wry: N=N NH,

S 0:11 H01 S I 13 S 0411 Grey Dark grey.

m N=N N= NH:

H O 3 S H O x S The coupling in cases 3, 4, 5 and. 8 may be carried out without addition of pyridine.

Example 2 hydroxynaphthalene:7-sulfonic acid from a sodium carbonate alkaline solution by means of sodium chloride.

This disazo dyestufl' can also beprepared by combining the suspension of the diazo compound of the aminomonoazo dyestuif with the aqueous solution of the O-toluene sulfonated Z-amino-B- hydroxynaphthalene-7-sulfonic acid, splitting off the toluene-sulfo-group by means of alkali when the coupling is complete and separating the dyestuff by addition of sodium chloride.

The dyestuff dissolves in water with orangered coloration, in concentrate sulfuric acid with blue coloration.

To the ice-cold solution of the above disazo dyestuff, corresponding to 6.9 gms. of sodium nitrite, in 1000 gms. of water which contains surplus sodium carbonate, 280 gms. of pyridine and the solution of the diazo pound of the disazo dyestufi v corresponding to 6.9 gms. of sodium nitrite, are 10 added with stirring and strong cooling (2 0.). When the coupling is complete the dyestufi is salted out, filtered ofi, dissolved again and precipitated from sodium carbonate alkaline solution by adding sodium chloride. The dyestufi 15 corresponds in the free state to the formula:

acid suspension of 0.114 mol of 2-amino-5-hydroxynaphthalenee7-sulfonic acid, corresponding to 7 parts of sodium nitrite, and stirred until the coupling is complete, whereby the mixture is ,always kept weakly acid; finally it is heated up to about 60-70 C., rendered alkalinev to sodium carbonate and the dyestufi is precipitated by sodium chloride. i

The disazo dyestufi may also be prepared in amanner similar to that described in the preceding examples by using the O-toluene sulfonated 2-amino-5-hydroxynaphthalene-7-su1- Ionic acid. i

The dyestuff dissolves in water-with orangebrown coloration, in concentrate sulfuric acid with brown coloration.-

To the ice-cold'solution of the above disazo dyestufi", corresponding to 6.9 gms. of sodium nitrite, in 1000 gms. of water which contains 50 gms. of 30% ammonia, 250 gms. of pyridine and I Dyeing on y ng co 0]: Ammodisazo dyestuffs aftertreated on cotton with copper salts 0 (31120 0 OH HOQN=N N=N NH, Grey Greenish l green grey.

S 0:11 S 0311 QN=N N=N -NH, Grey HO:

Example 3 the suspension of the diazo compound of the The suspension of 0.094 mol of the diazo compound of the monoazo dyestufi CODE monoazo dyestufi OCHz.COOH

coon oomoooH 0H t con and dyes cotton blue-grey shades, when. after- ,treated with copper salts grey shades.

Example 4 The suspension of the diazo compound of 0.174 mol of the monoazo dyestufi V a 0011 team. A

corresponding to 12 gms. of sodium nitrite, is combined at room temperature with the freshly prepared, weakly acid suspension of 0203 mol of 2-amino5-hydroxynaphthalene 7 sulfonic acid, corresponding to 14 gms. of sodium nitrite,- v

excess sodium carbonate, 250 gms. of pyridine and the suspension of the diazo compound of the disazo dyestufis oomooon.

no N=N NH;

corresponding to 6.9 gms. of sodium nitrite, are I added with stirring at 2 C. The isolated dyestufi corresponds in the free state to the formula:

OCHziCOOH OH I p HOaS SOaH 80:11

with copper salts grey shades.

Example 5 The aqueous suspension of thediazo compound of 0.498 mol of the azo dyestuff 4, t 7 7 corresponding to 34.3 gms. of sodium nitrite,

pared, weaklyacid suspension of: 0.551 .mol of 2-amino5-hydroxynaphthalene-7sxilfonic acid, corresponding to 38 gms. of sodium nitrite, :and

the mixture is stirred until the coupling is completegkeeping the mixture always weaklyacid. Finally-it is heated up to about 60 6., rendered alkaline with sodium carbonate and the dyestufi is separated byradding sodium chloride.

This 'disazo-dyestuff mayalso bef prepared by employing the O-.toluene sulfonated. 2+amino-5- hydroxynaphthalene-7-sulfonic acid, as described in Examples 1 and2. l I Q The dyestufi dissolves in water 'with'orangered coloration, in concentrate sulfuric acid with blue-green coloration.

To the ice-cold solution of the above disazo dyestufi, corresponding'to 6.9 gms..3of sodium nitrite, in 1000 gms. ofwater,,which contains 70'gms. of anhydrous sodium carbonate, 280 gms. of pyridine and the diazo solution of. the disazo dyestufi Y 03H soul corresponding to 6.9 gms. of sodium nitrite, are added While stirring at 2 C. The isolated dyestufl corresponds in the free state to the formula:

- H: and dyes cotton blue-green shades.

If the diazo compound of the aminodisazo dyestuff of the above constitution is replaced .by the equivalent quantity of the diazo compoundof;

5 the following-aminodisazo dyestufi s 0011 and dyes cotton greenish grey, when aftertreated 5 a dyestufi is obtained dyeing cotton reddish'bluegreen shades.

Example '6 The aqueous suspension of the diazo compound of 0.104 mol ofthe azo dyestufi sogn on;

mixed at room temperature with fthefreshly precorresponding to 7.18 gms. of'sodium nitrite, is 'the freshly prepared suspension of 0.464' mol of combined at room temperature with the freshly 2-amino-5 hydroxynaphthalene-7-sulfonic acid, prepared, weakly acid suspension o'f-'0:116"Imol corresponding to 32 gms. of-sodium nitrite, the of 2 -'amino-5 -hydroxynaphthalene"-T7 sulfonic mixture is then rendered weakly acid by adding acid, corresponding to 8 gms. of sodium'nitrit'e, 5 a solution of sodium acetate and stirred until and. stirred. The mixture is always keptiweakly the coupling'is finishedf Finally'it'i's heated up acid duringthe coupling; finally to complete the to about 6070 C. and the dyestufi is isolated coupling the mixture is heated up to ajbout BOC. from sodium carbonate alkaline solution by addand the dyestuff is isolated 'from sodium'caring sodium chloride. bonate alkaline solution by-adding-sodium chlo- 10 This di'sazo dyestuff can also be prepared by ride. As described in the preceding examples also employing the O-toluene sulfonated 2-amino-5- the O-toluen sulfonated '2-amino-5-hydroxyhydroxynaphthalene-7-sulfonic acid, as denaphthalene-7-sulfom'c acidl may be'us'ed for the s'cribedin Examples Land 2. preparation of this disazo dyestuif. 4 The. dyestuff dissolves in, water, with orange- The'dyestufi dissolve ,in ater with ()rangered coloration, in-concentrate sulfuric acid with red coloration, in concentrate sulfuric acid with blue-green o blue-green coloration. T T a To; the ice-cold solution of the above disazo To the ice-cold solution of the above"disazo y fi fi. esponding t0;6.9 gmshof 'sodium dyestufl, corresponding to 6.9 gms. of sodium nitrite, in 10 0 gins. of. water W ich conta ns 80 nitrite, in 100.0 gms. of water which'fcontains gms. of: anhydrous ium rb 230 m 80 gms. of anhydrous sodium 'carbonate;:-::280 of ipyridinev and the diazo solution of the, disazo gms. of pyridine and the suspension of the'diazo dye a 111-3 2' 1 compound of the disazo dyestufl 1 Q HOQ Na, o OH V $0. 3 :11" so 0' corresponding to 6.9 gms. ofsodium nitritegare V l added while stirring at -2" Gl- The-isolated corresponding to'6.9 gms of sodium-nitrita'are OOHz.OOOH Jill.

dyestufi corresponds to the formula: ,1 added while stirring at 2 C. The dyestufi is and dyes cottongreenishgray liadesi the yei'ng isolated "in the usual manner; it corresponds in aftertreated with copper salts is likewisegreen thefree, state tothe formulas,

( 3H: g I O H ish grey. Also when aftertreating with inickel, and dyes cotton reddish blue shades... I cobalt, chromium or iron salts greenishgrey '3 H ,7 Eample, 8 shades are obtained.

' To the ice-cold solution of the disazo dyestufi Example M described in Example 1, corresponding to 6.9

5 A 1 0,4 gms. of sodium nitrite, in 1000 gms. of water g g ii ggg i g fifig dlaz-o 5 which contains gms. of anhydrous sodium carbonate, 250 gms; of pyridine and thesuspencorresponding-to zar'gms'. of sodium nitrite, is corresponding to 6.9 gms. of sodium nitrite, are mixed at room temperature lwhilelstirring with added" whilestirrin'g at -;2 'C. The dyestumis sion of the diazo compound of the monoazo dye- I stuff,

qooonj isolated in the usual manner; it corresponds in the free state to the formula:

( OOH and. dyes cotton dark grey shades; the dyeings aftertreated with copper, cobalt, nickel, iron or chromium salts are dark grey.

If the diazo compound of the aminoazo dyestuff of the above constitution is replaced by equivalent quantities of diazo compound of the aminomonoazo dyestuffs shown in the table, dyefrom the group consisting of .aminoasulfonicacids COOH nents selected from the group consisting of middle components of the benzene and naphthalene series, M2 stands for the radical of a middle'component of the benzene series, each of the radicals M, M1 and M2 bearing the N=N- group's at stuffs are obtained dyeing cotton the following tached in p-position to each other, and n stands shades: for one of the values 1 andO, dyeingcottonand Dyeing on Ammomonomdwm ases stats copper salts oomcoon 1 HoQN=N-Nm Dark grey- Black grey.

l H000 CH:

ocmooon 2 HOQN: NH, Grey Grey.

SOaH

The coupling in the example as Well as that of the dyestufi (1) of the table may be carried out also without addition of pyridine.

We claim:

1. As new products substantive polyazo dyestufis of the general formula:

wherein A--N=N-- and A1N=N stand for radicals of diazotized initial components selected from the group consisting of amino-sulfonic acids and amino-carboxylic acids of the benzene and naphthalene series, M and M1 stand for radicals of middle components selected from the group consisting of middle components of the benzene and naphthalene series, Ma stands for the radical of a middle component of the benzene series, each of the radicals M, M1 and M2 bearing the N=N groups attached in p-position to each other, and n stands for one of the values 1 and 0, dyeing cotton and regenerated cellulose blue, blue-grey, grey to black shades.

2. As new products substantive polyazo .dyestuffs of the general formula:

regenerated cellulose blue, blue-grey, grey to black shades.

3. As new products substantive polyazo dyestuffs of the general formula:

H0 8 NH:

wherein AN=N- and A1N=N- stand for radicals of diazotized aminosalicylic acids, bearing the -N=N group in p-position to the OH- group, M and M1 stand for radicals of middle components selected from the group consisting of middle components of the benzene and naphthalene series, M2 stands for the radical of a middle component of the benzene series each of the radicals M, M1 and M2 bearing the N=N- groups attached in p-position to each other, and n stands for one of the values 1 and 0, dyeing cotton and regenerated cellulose blue-grey, green-grey, grey, dark grey to black shades, the fastness to light and water of which becomes improved by an aftertreatment with agents yielding metals.

4. As new products substantive polyazo dyestufis of the general formula:

radicals of-diazotized initial components selectedwherein AN=N- and .Ai-N=N-- stand for radicals of diazotized aminosalicylic acids, bearing the N=N group in p-position to the OH- group, M stands for the radical of a middle com- HOQN=N oon ponent selected from the group consisting of middle components of the benzene and naphthalene series, M2 stands for the radical of a middle com ponent of the benzene series, each of the radicals M and Mzbearing the N=N- groups attached in p-position to each other, dyeing cotton and regenerated cellulose blue-grey, green-grey, grey, dark grey to black shades, the fastness to light and water of which becomes improved by an aftertreatment with agents yielding metals. 1

5. As a new product the tetrakisazo dyestufi of the formula:

HOIS

15 dyeing cotton and regenerated cellulose dark grey 

